Power screw driver



FIG. 1 is a front elevational view of a power screw driver showing ournew design, the rear elevational view being a mirror image;

FIG. 2 is a left side elevational view the right side elevational viewbeing a mirror image;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The ornamental design for a power screw driver, as shown and described.